fix: add missing faiss-cpu dependency to requirements.txt

[Pratyush-Panda-2006]

fixes #1663

What Was Done
Created New Branch: Checked out the main branch, pulled the latest changes, and created a new branch fix/issue-1663.
Added Missing Dependency: Added faiss-cpu>=1.7.4 to
requirements.txt
to resolve the missing dependency for two_tower_retrieval.py and test_neural_retrieval.py.
Verified Functionality:
Installed faiss-cpu in the local environment and ran the tests.
Verified that tests/test_neural_retrieval.py now runs and passes successfully:
bash

pytest tests/test_neural_retrieval.py

[github-actions]

🎉 Welcome to Hybrid Recommender, @Pratyush-Panda-2006! This is your first contribution here!

Labels added: gssoc:approved | mentor:leonagoel | status:review-needed

PR Description Checklist:

NO - What changed section
NO - Why section
NO - How to test section
YES - Related issue linked

⚠️ Some required sections are missing. Please update your PR description.

What happens next:

1. @leonagoel will review your changes
2. CI checks must pass
3. Once approved, this PR will be auto-merged

⏱️ Please respond to review comments within 48 hours.

[github-actions]

⚠️ Main branch was just updated!

PR #1633 ("fix: Duplicate results-processing loop removed from search_items(#1631)") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1640 ("fix: resolve hybrid_model merge conflicts and add explanation string") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1641 ("Fix/svd memory leak") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1642 ("Feature/evaluation dashboard") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1643 ("Feature/streamlit tfidf config") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1644 ("Fix/strict csrf origin validation") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1645 ("Feature/svd online updating") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1647 ("fix: add title query param endpoint to resolve HTTP 422 (#1075)") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1648 ("fix(federated): prevent regularization decay in aggregate_updates") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1650 ("fix: remove duplicate code block in hybrid_model.py causing Indentati…") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1653 ("fix: remove duplicate /api/recommend route") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1654 ("build: add faiss dependency for two-tower retrieval") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1655 ("fix: enforce stronger signup password validation") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1660 ("security: reject unissued csrf tokens") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[github-actions]

⚠️ Main branch was just updated!

PR #1661 ("feat: add KNN-based user collaborative filtering (Issue #51)") was just merged into main.

Please rebase your branch to avoid conflicts:

git fetch origin
git rebase origin/main
git push --force-with-lease

Keeping your branch up to date prevents merge conflicts. 🚀

[leonagoel]

🎉 Merged!

Points will reflect on the GSSoC leaderboard at next 4 AM IST refresh.

🏆 https://gssoc.girlscript.org/leaderboard